TSA apologies for screening that upset 3-year-old

The Transportation Security Administration is apologizing after agents at Lambert Airport in St. Louis sought to screen a 3-year-old girl in a wheelchair.

The mother of the child shot video that caused a stir in social media after it was posted online.

The incident happened Feb. 8. The girl and her family were about to fly to Disney World in Orlando, Fla. A TSA agent asked to pat down the 3-year-old and screen her wheelchair. The agent initially told the girl's mother, Annie Schulte, it was illegal to tape the activity.

On the video, the little girl, Lucy, who has spina bifida, is seen crying.

Agents eventually decided against a pat-down.

The TSA says it regrets the incident and will address concerns with its workers.